Basically i want to know how this is done.

Example -

At work i go on a Windows 7 computer create a VPN connection with standard username and password. I then forward the correct ports thats fine.

How do i actually connect to it from the n900 though

Our Gateway is 192.168.10.254 this is the gateway i need to be on.

Any ideas guys i dont want to connect to a VPN server in china or USA i just need to connect to work with our External IP a username and a password.

Cheers